of the Pacific Shores of North America. 459 



fornian coast. Antero-lateral margin ten-toothed ; teeth but 

 little prominent, with the exception of the posterior one, 

 which is separated from the next by a considerable space ; 

 they gradually diminish in size toward the orbits. Termi- 

 nal segment of abdomen in the male short, with a rounded 

 extremity. Third article of outer maxillipeds somewhat 

 granulated, with the exterior apex broadly truncated. Feet 

 of the second pair longest, and equal in length to the width 

 of the carapax. In adult specimens the tarsi of the fifth 

 pair of feet are very much compressed, and not conspicu- 

 ously ciliated below. In a specimen from Sitka, the gran- 

 ulation on the upper side of the feet of the posterior pairs 

 is much stronger, and the teeth on the crest of the hand less 

 numerous and higher, than in Californian specimens. The 

 following are the measurements of several specimens in the 

 Museum of the Smithsonian Institution : — 



Locality. 



Sex, 



Puget Sound, 



$ 



San Francisco, 



u 



Monterey, 



u 



San Francisco, 



(C 



Sitka, 



(( 



San Francisco, 



9 



Length of 

 Carapax. 



0.875 inch. 



Width of 

 Carapax. 



1.27 inch. 



Proportions of 

 Carapax. 



1:1.45 inch. 



1.23 



1.80 



1:1.46 



2.51 



3.77 



1:1.50 



4.42 



7.00 



1:1.58 



4.90 



8.85 



1:1.80 



2.55 



3.90 



1:1.53 



By these measurements and proportions it will be seen 

 that this species increases in width with age, and that the 

 female is slightly broader than the male. I have seen no 

 specimen according in dimensions with the variety figured 

 by Dana. 



This species was erroneously referred by Randall to C. 

 irroratus. Say. The succeeding species, however, approaches 

 much more closely to the eastern crab. 



C. magister has been found at Sitka, (Trowbridge ;) 

 Puget Sound, (Suckley;) San Francisco Bay, (Pickering, 

 Kennerly, etc. ;) and at Monterey, (Taylor.) It is the com- 

 mon crab of the San Francisco market, and is caught very 

 abundantly about the wharves of the city. It is of a light 



